Stand by Oneself

As more students die trying to escape from the hotel, Chibiki arrives to save Naoya and Yuya from the killer. Meanwhile Koichi comes across Tomohiko, who had been randomly killing students in order to find the extra one and starts attacking Koichi but is stopped by Izumi. Koichi returns to the house where he finds Izumi attempting to kill Mei, only for her to be hit by shattered glass caused by a lightning strike. As she passes away, she mentions Koichi about how they had met a year and a half ago. As Koichi finds Mei later on, he learns that the extra one is Ms. Mikami, aka Reiko, who was murdered a year and a half ago. Realising the memories he had forgotten, Koichi reluctantly kills Reiko himself, ending the calamity. After Koichi and Mei reflect on the memories they may soon forget, they and the other students record a new message for those who may face the calamity in the future.